You need to decide the specifications first, then do some internet searches.
Try to find solutions on your own.
We will help you to rectify mistakes, but we won't to your job.
Even if we want, we can't because "1000W" is the only information we have.
Way too less informations to even recommend a circuit.
hello
don't think 1000W amplifier is some thing easy to build even if you was meaning audio amplifier
because the schematic diagram is not enough to build it needs some math calculation concern with concept of impedance matching you need
A 1000W audio amplifier will explode almost all speakers. Its power supply and output voltages can kill you. It will be very expensive.
Here is a good 1500W amplifier project: https://sound-au.com/project117.htm